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DY: Fachverband Dynamik und Statistische Physik
DY 30: Nonequilibrium Quantum Many-Body Systems II (joint session TT/DY)
DY 30.9: Talk
Wednesday, March 29, 2023, 17:15–17:30, HSZ 204
Vibrationally-coupled electron transport in a quantum shuttle: A study using the hierarchical equations of motion approach — •Salvatore Gatto, Christoph Kaspar, and Michael Thoss — Institute of Physics, Albert-Ludwigs-Universität Freiburg
A quantum shuttle is an archetypical nanoelectromechanical device, in which the coupling
of electronic and mechanical degrees of freedom is crucial [1]. In this contribution, we
investigate transport properties of quantum shuttles, with a particular focus to the
so-called shuttling regime, in which the transport of electrons is synchronized with the
mechanical motion. The transport characteristics are strongly influenced by the interplay
of electronic and vibrational degrees of freedom, which manifests itself in step structures
of the current-voltage characteristics. An effective molecule-lead coupling results in
an increase of the current with respect to the tunneling regime. The study uses the
hierarchical equations of motion approach, which allows a numerically exact simulation
of nonequilibrium transport in general open quantum systems involving multiple bosonic
and fermionic environments [2].
[1] Novotný et al., Phys. Rev. Lett. 92, 248302 (2004)
[2] J. Bätge, Y. Ke, C. Kaspar, and M. Thoss, Phys. Rev. B 103, 235413 (2021)